Riley and Bailey Marshall, identical twins, 9. They were born at 30 weeks at John Hunter Hospital, and spent time in NICU before being transferred to The Maitland Hospital Special Care Nursery. Picture: Maddison Tyne

Evan and Anthony Hawas. Picture: Shelley Hawas

Kristy, Kimm and Kelly.

Harley and Jerzy, 7. Picture: Kashia Louise

Picture: Tracy Shepherd

Two sets of twins, 2011 and 2018. Picture: Rhi King

Sebastian and Chase, 6. Picture: Trudi Russell.

Jasmine, Tamara and Maya. Picture: Janet Hibbs.

Picture: Katy Tyler

Amelia and Isabella. Picture: Rebecca-lee March

Braxton and Zarlee. Picture: Jasmine Hoffman

Picture: Terrie Anne Forbes

Picture: Nikki Circosta

Left, Melanie and Felicity Adams, of Cessnock, at Christmas 1986, and at right, now Melanie Clark and Felicity Robbs, in September 2017 (picture by Lynda Hinton). The twins gave birth to daughters Ruby and Audrey, six weeks apart.